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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d6a8027f0f683834c2da8ceb63d8b4339ccf1d7faf486a198ea8d5d56dc3dc5' 
  AND token = 'jm/rbLM64tH3wH4w48xJSKpexB4QC3vF1gXnCv7ZgMw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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