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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '141e1255bed0eb7bd886ae8b521656a30122954bdbf9d52f5004d714ab6196ad' 
  AND token = '0Y+2gdRq40WgJAS5PkSwpumW4CulUNU3t4xuAYvtCqY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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