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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e6d74903e78a81612d20bb7da26c7fa7efc7e24d2fd7870c44f4a60c47fe67b' 
  AND token = '9iv9psdVB7YjI5Ld89/nMnGoQwdYGkF3RXdh42uigj8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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