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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '557aa78286021f544cdf22614858ca48bc837d8fcc898647c0adaab563b84e01' 
  AND token = 'etAfv8mx2HVmpymqS+Uh5aVbH4CIvNVqav1ZN5KpkV0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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