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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdcabda37a0f486e8b9e6c86e49cda84f85a399eba1cad000845b64abf855ccf' 
  AND token = 'pBQ/OlVY78lyP00tHk3MPWliIOHZA909/P0atFFq2Sg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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