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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3ac341e29a2ec1f0c0a7f9275d0802919b172dc338c7b1ac9cd03dd83e9e9aa' 
  AND token = 'OOd5QE1pSqei7YZZ50jUyihcs5wGAJpJnoT1z5PgrFo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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