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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc247dffdd7c1390bc9c4d5c83eced77404a3bf2f478364c3f35061fa4d5ffb2' 
  AND token = '6xJq1pu8PB09zdqh+SjDEoiPM6G76hini8LEZLcsrbE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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