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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9362d8e74508f185f9a7b53e6b90dd673c03c8dc2c94b7c5f3b3485332707244' 
  AND token = 'XX1l4PYW/3lrnL8fslTMe0EAqTVdVwdyS/EJtkoywOE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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