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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1902b2b06aa397a1e9a72c14fb85656ad816693dd0aa8a770d62d27136b23afc' 
  AND token = 'pU65SExa3FhBMK12HYdbG9j2+cnu5CrS6sIGVcZE0Ko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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