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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'babeaaad04cfee2c95ff943e24c705b82d5aac6b9bbe922e3ef0851a8d29d939' 
  AND token = 'irQHCyqz7CLJxtnGeucbuuXOzDcrFe0LUjL+3SjO58M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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