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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '737e985f1f12991ad1bb1ea353822a73f83230f0414823c769a0064b3f35ccbf' 
  AND token = 'dnFbZt9NfTmlhMiqTbK6Dkx8FzMIalBvPiIdCs+X7xk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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