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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7125500b18d540c9241be31c559815bfb3ae95b5ca3f0c6e02248f25f466e0e' 
  AND token = 'fEafLipYJFFqwEnaXAOkCEkfiIfYgjKQ7bumJAEyZy0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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