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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29c8e2521f1fcb6716fe8a2d51fdeefc6390ff5489961829c962b673733a0ecd' 
  AND token = 'mA0LNIYJM6VsaM+XmDK3ed6i7zQH6MW6t3e3liJGX/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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