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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c163e49f61a5678572be69fb0430494cb6d3148bb6305a21b9675c64ea8cbef' 
  AND token = 'Hc0qQKc+TosRsK92C3AOksqSbNs1V8Y39OXlyBZn3RU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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