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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d020a02a8e88aae2005bc5027745f570a0a7c354ed5c2ac2ea0a0924b47b907' 
  AND token = 'rEA92Ljm3a1qXCgzh1w1ixEBhYROa/YX75+VXmQsg/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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