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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f3b6e477816ec4d70e2c936d5f2c43240cbe6bded8e88bcde9c6eaf79b53ba4' 
  AND token = 'D0OdN71uv7O+9x5QicaI0q5g8o80NC14emXU4QOlIqk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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