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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '695fc252c0aed85dc1669a9201eb8839d1a874a6e0f15c56b1ce34eceab3f674' 
  AND token = 'UWsT69ycksBQqvr1b6fv+pHgAClXXpMt3rURydKRbRo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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