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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28be2503a96624a76ec34b7b9ac3d269395b2afa4ed8d7bffd890fcc2880cd76' 
  AND token = 'jwunnoxBbvrl+IyMdYrL9jI2sojDsCfdaMFgb8ku6c8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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