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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e962bf03b0cc45bf6a70777eca9da49fd9128677a86feeef60bdb9b11f58f82' 
  AND token = 'ql5HasG8lrlfgJP9v+ytNP5Fj6FGV64WdNlIDW2fo/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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