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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00aca3833d8aeb89e49f92d3105657bbfc985f44a770504f5fb68396fc2e19b4' 
  AND token = 'ss3Qz9Z+IirP/3ILH3w1urDNjSO529w3R9htRd8aWw8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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