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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0755712dd4c09d98eb2d456b6d32562021ec844be826869edc3d5e912767b4a' 
  AND token = 'pVdZqHkMJY1uV3H+mbFenWVo4sr2TUkdGNCwdQG+Um8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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