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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2908c1645bbf308c210eb26c46b05256c3f640a345b8973f56006ba4e0bedd85' 
  AND token = 'ipOV/7sFqaui/cEkku/UKY9JaJN4+j6VFwvMItb5rT0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00107

JSON explain

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