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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b86faa938a3f7ea4b74abbef7089ca6634e18ea991c38f17bbf0c07e826217e' 
  AND token = 'gWIW3XpOcxMHU577wrzhg+3Lz7KVwgfcSgHc0Q3u85M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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