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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd460098db7e81741b4e446190d2de68081865d0340b47408c3304a4c371b8f05' 
  AND token = 'pd3mAhIGg4Vhi3ILKiMSE+6N/Mzhlg1x0uaqMh38ccQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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