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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd2e17988f4326c1cda8dbb25b2c9c0983927b2cfc5e8bf19b107080f25c9f4e' 
  AND token = '1hrSUaGwpt6iZl7tWOvWEvVXTT4+F19oY9C50pn0TGo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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