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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3256e7ec20779ed7ade23f191a3f528f91b6c32dc546d3fbb0fd234d409fd4b0' 
  AND token = 'hj2Y9HSsXQk6CveNJYG2/tiHHAvV9pu5KI99RCu5qEY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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