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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f060d6219c1764ae5177cd651bd4c9aa5eb7fad174d457b1982154dae9dc45ba' 
  AND token = '6OB950OpBa0JHqII11obnObqQlDCBZoh+moL4RCOfxo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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