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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c830121dc33ae8f5c1a522d9ec5d4616d4ff884b43b577adca326198f226d86f' 
  AND token = '0OuosgxwbUPF7valpNNt0uN4uXIK0p8mwTBEdhHvBvc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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