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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5df2f92de1aaead9cc5ed597fb5b7c4d2bc4a0d9f13c3fb2c24bab8ef6149c3b' 
  AND token = 'i/hD5QTcWSOzahsur8zgbXMBUt5WVdTJuJx3rP5RVtE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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