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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9e433d3d3b3cb3e192b617fbca5ff7fb49041b6c9bbb633e46bdcb08d4a5d9a' 
  AND token = 'xbQXxLEmkuhn034PsUpW9dBSK30MLD0TC5H1l/X4n0Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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