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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'faa0e8e416856bba477109a9e79d346abf66fe147533c18c3d430f0dc3cb66ea' 
  AND token = 's3yXuLl8vOQD1Rj+lbeOuqUGxliZTTiY1N2mSkJu7iA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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