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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e38c3e3fe41c5ee4b6211c3d9e58ecf7c8c36670bc4babc0ad7a1348254650c2' 
  AND token = '2MOE0Pw3n5+15cL9x/UlkDZchOrmbpUXqeJTnTDrc40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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