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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0dc5a16492a292008c746832d1155b85cad0608520f367c3ed6bcd79f701ed04' 
  AND token = 'eyOQV5/BkYVbEAbSqQohyRHBmMvBWvx6iXFMp7lszg0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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