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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d83e59f1ba70a1cb11b33f4f38c9f60fca64c24051b0344fc9b6d244c163679' 
  AND token = 'pHpImugBxtnwt8oBpWn4EtmLVCp6vx/u/BEcUO/J1TY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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