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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6a988f6beb2edf55b237ec51b233240eb3a4344f388ccd3e2bf8f4ac83d61c2' 
  AND token = 'AwDlnJIR/HaU49po+3g3byO8Lx4BSq+lAaofAfo84bc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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