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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e29f4e0c5c297d49a08bd201c0d5db9ef2bf5272cdcabc52bb6a0e85c19f5960' 
  AND token = '9ToQMbxBFhWI5vIUJMg49g1sfURbwI7smJvjQRzCXGs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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