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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0cb4ec6c29dc7a2fbb1f5c0345cc19a510f5123e075b2fc9eb2b4af32dd6857' 
  AND token = 'rucBA6rIj6WWeFfDQZNhQfNkX7g2ug/nVyEfvMX9Eoo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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