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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74e147bf639d5eddd548384ecdd18d62893d34ddae305273e3d77e4456e89f9b' 
  AND token = '5vGnAfjuDSduYaeWDd3GzAdqC9/Aib/GaYY5oa/Yn90=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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