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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb29d0d6384ca3abe88fe709bb2afdcb77ebbf2d10c268dca8f04210509ce987' 
  AND token = '6nniFJwvLy3tI17dhIi5YjXcSzy3ldRK+YiY2fBefVg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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