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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9203dc555ceb9a214ab7d24d7529b2dd780f1ba05e9907226b84fdaa0c274ffa' 
  AND token = 'lcJTWcnCmEKlUefjgNfn6fUBjiYD31MBJZzybbafhaw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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