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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f555ecd500637593558d779698534e8fd415f4ddfeec1ec5b57f6f9125617ef4' 
  AND token = 'LyRxSmz8byM0e1IehbKX/Hk7PLPajo2vtnsowBngOtI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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