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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '354884133b0eab77adee7c47506e0f420b1f3aa14e41b596533d8ad169ff1c57' 
  AND token = 'RL6b0pRBlJEr+qhZVWHkt+1ZJDm7sdtSznhyU+ZMTQA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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