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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7e518ef41a12a1f2a542962c77a373fba92f6a3aebf60ba1352f1300f26dc98' 
  AND token = 'x9+RoDpyOJjb1OKBGeDdCEgs9ZS6T4sUUmqlF3mTb6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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