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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5568508618ac492119908f64543323c30df5afbbdc020989f14902e0c7d6fa11' 
  AND token = 'IJbBq79W0jnPr1E5aAzrf1+j10Zz84lZfH8yrg9+wRI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}