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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a9b0f298cdc9d0a0cb293b95288207dd0abef9087ef57198220d6ba89ee2537' 
  AND token = 'kNyKOqITaFvLYQsCGnX7qFJwcqj+OlRGLAbpxv0/N4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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