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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e67e094b35ceb75f813c3aaa38100a8e292822b42ea7448d8369d2b8437e3d43' 
  AND token = 'FI0yZAEhsL6YMehN/J3tTUysa4WIbcUVE8ft9xp54p8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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