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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96e6b7290e2065c02bd38eeb8fc96fa676f6a596d4831d7425594d5394adb55c' 
  AND token = '5yjLYvxR+jeK/20UeItY5Qo8qX7NCwANRqjQRbE7Py0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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