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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4939aa44eaa25b46251c918b2d3a7d42f3b34e2efb51ea2c4ae23c0e968909a' 
  AND token = 'u5JTme268S7lmDTk8zh+lZMrO7WYfGc/R8j4f7i/zGE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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