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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d988549f6c918adf3914233630e8ba2b91e048303b9379f3231e23cd26355b5' 
  AND token = 'FN2BHGsfdAC7Y25i37x1NoXWrw6SDrEnx9odPATuIaY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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