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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f19e92515f4ccd60fe582740682861b97f70f55cb65290df697445dcf7793326' 
  AND token = 'Mg74tyF+SiSivEDdzomu/3O6foFcXoF8rmnWGFNy+80=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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