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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e66b98f54b1f99c5ae293fc2e0e77a8fc4343e500ae12607fea38734d6ab436f' 
  AND token = 'I6BkL+UF+Pt9Vz4g/WxX4Hm88UT1VacwQGlPiq34gaA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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