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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5155cdc1a67650dc478e7b634e407ddb4fa4ef037ce705c6f3f9f6c9d947c180' 
  AND token = 'CFvanfJ8rQ2PV2Kjc3sJJQQAIs4J+bRv4ZmX1SN8x7k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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