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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '026bc5e04062d636760b97ed34a8823b74ad3b6db7a5b868ba07cc99d3e9bece' 
  AND token = 'rDrNhS9+bWbtKDx15YVltmeqJOjjzmBD6FDJH9lNsm8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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