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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5da46a87a0a64d7b6517f5d95469bea34d0c6550fc1c0be5e670b8db9ce487f' 
  AND token = 'XOUQ/48mBDK23Z2CNDaT06b9sM0m/MsE0hoz3W0P/Ig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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