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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9e0bc7e68b4fd925c0d4a16e3c94b90d54c68b8d15d3b11c2cda778036c4fa2' 
  AND token = 'xGdrToY43upIPH7fbp2fG+H4taHP/unyZul9rR/KksM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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